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https://issues.apache.org/jira/browse/PHOENIX-4523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16369024#comment-16369024
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Rajeshbabu Chintaguntla commented on PHOENIX-4523:
--------------------------------------------------

[~karanmehta93] This is missing in 5.x branch. Can you please commit it to 
branch as well. Thanks.

> phoenix.schema.isNamespaceMappingEnabled problem
> ------------------------------------------------
>
>                 Key: PHOENIX-4523
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4523
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.13.1
>            Reporter: Flavio Pompermaier
>            Assignee: Karan Mehta
>            Priority: Major
>             Fix For: 5.0.0-alpha, 4.14.0, 4.13.2-cdh5.11.2
>
>         Attachments: PHOENIX-4523.001.4.x-HBase-0.98.patch, 
> PHOENIX-4523.001.patch
>
>
> I'm using Phoenix 4.13 for CDH 5.11.2 parcel and enabling schemas made my 
> code unusable.
> I think that this is not a bug of the CDH release, but of all 4.13.x releases.
> I have many parallel Phoenix connections and I always get the following 
> exception:
> {code:java}
> Caused by: java.sql.SQLException: 
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hbase.TableExistsException):
>  SYSTEM:MUTEX
>       at 
> org.apache.phoenix.query.ConnectionQueryServicesImpl$12.call(ConnectionQueryServicesImpl.java:2492)
>       at 
> org.apache.phoenix.query.ConnectionQueryServicesImpl$12.call(ConnectionQueryServicesImpl.java:2384)
>       at 
> org.apache.phoenix.util.PhoenixContextExecutor.call(PhoenixContextExecutor.java:76)
>       at 
> org.apache.phoenix.query.ConnectionQueryServicesImpl.init(ConnectionQueryServicesImpl.java:2384)
>       at 
> org.apache.phoenix.jdbc.PhoenixDriver.getConnectionQueryServices(PhoenixDriver.java:255)
>       at 
> org.apache.phoenix.jdbc.PhoenixEmbeddedDriver.createConnection(PhoenixEmbeddedDriver.java:150)
>       at org.apache.phoenix.jdbc.PhoenixDriver.connect(PhoenixDriver.java:221)
>       at java.sql.DriverManager.getConnection(DriverManager.java:664)
>       at java.sql.DriverManager.getConnection(DriverManager.java:270)
> {code}
> This is caused by the fact that all the times the SYSTEM tables are 
> recreated, and this cannot be done simultaneously.
> Trying to debug the issue I found that in 
> ConnectionQueryServicesImpl.createSysMutexTable() the call to 
> getSystemTableNames() always return an empty array and the SYSTEM:MUTEX  
> table is always recreated.
> This because getSystemTableNames() doesn't consider the case when system 
> tables have namespace enabled. Right now that method tries to get all tables 
> starting with *SYSTEM.\**, while it should try to get the list of *SYSTEM:\** 
> tables..
> I hope this could get fixed very soon,
> Flavio



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